PSLE
Stationery Kiosks B and C sell rulers of four colours. The bar graphs show the number of rulers sold by each shop in September. The bar for the number orange rulers sold by Stationery Kiosk B has not been drawn.

1. Half of the rulers sold by Stationery Kiosk B were orange rulers. How many orange rulers did Stationery Kiosk B sell?
2. Which colour(s) of rulers did Stationery Kiosk B sell less than Stationery Kiosk C? Give your answer(s) in letter(s) in alphabetical order. (Eg Blue, Red = B, R)
3. In October, Stationery Kiosk C sold 35 more green rulers than the number of green rulers sold in September. What was the percentage increase in the number of green rulers sold by Stationery Kiosk C from September to October?

(a)
Number of green rulers sold in Stationery Kiosk B = 250
Number of yellow rulers sold in Stationery Kiosk B = 250
Number of blue rulers sold in Stationery Kiosk B = 125

Since orange rulers sold in Stationery Kiosk B is half of the rulers sold by Stationery Kiosk B, the total of green rulers, yellow rulers and blue rulers is equal to orange rulers.

Number of orange rulers sold in Stationery Kiosk B
= 250 + 250 + 125
= 625

(b)
Number of green rulers sold in Stationery Kiosk B = 250 (More)
Number of green rulers sold in Stationery Kiosk C = 100

Number of yellow rulers sold in Stationery Kiosk B = 250 (Equal)
Number of yellow rulers sold in Stationery Kiosk C = 250

Number of blue rulers sold in Stationery Kiosk B = 125 (Less) 
Number of blue rulers sold in Stationery Kiosk C = 225

Number of orange rulers sold in Stationery Kiosk B = 625 (More) 
Number of orange rulers sold in Stationery Kiosk C = 100 

Colour(s) of rulers that Stationery Kiosk B sold less than Stationery Kiosk C = Blue (B)

(c)
Percentage increase in the number of green rulers sold by Stationery Kiosk C from September to October
= ³⁵₁₀₀ x 100%
= ⁷₂₀ x 100%
= 35%

Answer(s): (a) 625; (b) B; (c) 35%